In the Laboratory Aim Density (LAD) printing control method, a standard control patch specifies densities midway between the minimum and maximum of those typically obtained for a normal camera exposure.

These specific densities have suggested tolerances for each film type in the duplicating and print system, and are listed in this publication, along with helpful hints for their use and evaluation.

All color films in a production, regardless of film type or origin, are timed with respect to the LAD control film. Each frame of LAD control film, having the standard patch, with proven accurate exposures plus other information, is available from Eastman Kodak Company.